a = list(map(int,input().split()))
summ=0
for i in range(a[0]+a[0]%2,a[1]+1,2):
summ+=1
print(summ)
a = list(map(int,input().split())) summ=0 for i in range(a[0]+a[0]%2,a[1]+1,2): summ+=1 print(summ)
too ez, too simple